The operator who operating the Intra-corporation network communication service shall lease circuits from Type I Telecommunications Business to provide links between users and networks, and between intra-network joint points and shall not have the following acts:
1. to provide communication service of Non Intra-corporation network communication service for its users; and
2. to provide communication service of re-forward call of the call-terminating part for its users.

With respect to the linkage which constitute Intra-corporation Network Communication, one of its call-originating part and call-terminating part shall interconnect with the leased line; the part that interconnects with the public telecommunications network shall not start to provide its communication service until the confirmation procedure of operator's network joint points.
With respect to the confirmation procedure as referred to in the preceding paragraph, an operator shall illustrate in the business plan when applying for permit.

An Intra-corporation Network Communication Service operator shall reserve its users' essential information at least one year after the contract ends.
The users' essential information as referred to in the preceding paragraph shall include name and address of internal units, branch companies, branch institutions, and subordinate companies, the certificate documents of intra-company relation, intra-company numbering proposal, and the circuit number of leased line that connect network between operator and user.
If the intra-company relation of a user is subordinate company, an intra-corporation network communication service operator shall submit name and address of a user and the certificate documents of intra-company relation for the Competent Authority records.

A Intra-corporation Network Communication Service operator shall be recorded and reserved the circuit number of leased line that connect intranet joint points, tables of related routes and the communication record information.
The circuit number of leased line that connect intranet joint points and tables of related routes as referred to in the preceding paragraph must reserve continuously and the record information of telephony shall be reserved for six months at least.